tools(deps-dev): Update icanhazstring/composer-unused requirement from 0.9.4 to 0.9.5 in /tools/composer-unused (#576)

Updates the requirements on
[icanhazstring/composer-unused](https://github.com/composer-unused/composer-unused)
to permit the latest version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/composer-unused/composer-unused/releases">icanhazstring/composer-unused's
releases</a>.</em></p>
<blockquote>
<h2>0.9.5</h2>
<h2>What's Changed</h2>
<ul>
<li>chore: Use 8.1 for build and phar validation by <a
href="https://github.com/icanhazstring"><code>@​icanhazstring</code></a>
in <a
href="https://redirect.github.com/composer-unused/composer-unused/pull/699">composer-unused/composer-unused#699</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/composer-unused/composer-unused/compare/0.9.4...0.9.5">https://github.com/composer-unused/composer-unused/compare/0.9.4...0.9.5</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/composer-unused/composer-unused/commit/13b1d32e35e7c6dc997c01342c4fe1b217b6d767"><code>13b1d32</code></a>
chore: Use 8.1 for build and phar validation</li>
<li><a
href="https://github.com/composer-unused/composer-unused/commit/c6021e9f3737cef2baf9a22bb3bed08023bfac1a"><code>c6021e9</code></a>
github-actions(deps): bump shivammathur/setup-php</li>
<li><a
href="https://github.com/composer-unused/composer-unused/commit/4f646db5d254eb6f90ca4950467945ec883a34ea"><code>4f646db</code></a>
github-actions(deps): bump the dependencies group across 1 directory
with 2 u...</li>
<li><a
href="https://github.com/composer-unused/composer-unused/commit/4421b925c32dd4c2a61f7a44852111fb97ca05a5"><code>4421b92</code></a>
chore: Update CHANGELOG.md</li>
<li>See full diff in <a
href="https://github.com/composer-unused/composer-unused/compare/0.9.4...0.9.5">compare
view</a></li>
</ul>
</details>
<br />


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Author: dependabot[bot]

tools/composer-unused/composer.json

@@ -6,7 +6,7 @@
         "php": "^8.1.31"
     },
     "require-dev": {
-        "icanhazstring/composer-unused": "0.9.4",
+        "icanhazstring/composer-unused": "0.9.5",
         "roave/security-advisories": "dev-latest"
     },
     "prefer-stable": true,